code: def test_get_directional_dir(self):
      directional_dirs = TCAV.get_directional_dir(
          self.mymodel,
          self.target,
          self.concepts[0],
          self.cav,
          self.acts,
          self.examples,
      )
      self.assertAlmostEqual(8.0, directional_dirs[0])
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tcav.activation_generator import ActivationGeneratorBase
  from tcav.cav import CAV
  from tcav.tcav import TCAV
  from tensorflow.python.platform import googletest
  import numpy
  import tensorflow
label_desc: Use image node_id 4 for calling the TcavTest obj's underlying member method code with example usage: obj.test_get_directional_dir() without return types